﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Globalization;

namespace ZhimeiSoft.Framework.Client.Control.DateTimeGrid
{
    public static class ChineseDateTime
    {
        /// <summary>        
        /// 实例化一个  ChineseLunisolarCalendar        
        /// </summary>        
        private static ChineseLunisolarCalendar ChineseCalendar = new ChineseLunisolarCalendar();
        /// <summary>        
        /// 十天干        
        /// </summary>        
        private static string[] tg = { "甲", "乙", "丙", "丁", "戊", "己", "庚", "辛", "壬", "癸" };
        /// <summary>        
        /// 十二地支        
        /// </summary>        
        private static string[] dz = { "子", "丑", "寅", "卯", "辰", "巳", "午", "未", "申", "酉", "戌", "亥" };
        /// <summary>        
        /// 十二生肖        
        /// </summary>            
        private static string[] sx = { "鼠", "牛", "虎", "免", "龙", "蛇", "马", "羊", "猴", "鸡", "狗", "猪" };
        /// <summary>
        /// 星期
        /// </summary>
        private static string[] chineseWeek = { "星期日", "星期一", "星期二", "星期三", " 星期四", " 星期五", " 星期六" };

        /// <summary>       
        /// 返回农历天干地支年        
        /// </summary>        
        /// <param name="year">农历年</param>        
        /// <returns></returns>        
        public static string GetLunisolarYear(int year)
        {
            
            if (year > 3)
            {
                int tgIndex = (year - 4) % 10;
                int dzIndex = (year - 4) % 12; return string.Concat(tg[tgIndex], dz[dzIndex], "[", sx[dzIndex], "]");
            } throw new ArgumentOutOfRangeException("无效的年份!");
        }
        /// <summary>        
        /// 农历月        
        /// </summary>        
        /// <returns></returns>        
        private static string[] months = { "正", "二", "三", "四", "五", "六", "七", "八", "九", "十", "十一", "十二(腊)" };
        /// <summary>        
        /// 农历日        
        /// </summary>        
        private static string[] days1 = { "初", "十", "廿", "三" };
        /// <summary>        
        /// 农历日        
        /// </summary>        
        private static string[] days = { "一", "二", "三", "四", "五", "六", "七", "八", "九", "十" };
        /// <summary>        
        /// 返回农历月        
        /// </summary>        
        /// <param name="month">月份</param>        
        /// <returns></returns>        
        public static string GetLunisolarMonth(int month)
        {
            if (month < 13 && month > 0) { return months[month - 1]; }
            throw new ArgumentOutOfRangeException("无效的月份!");
        }
        /// <summary>        
        /// 返回农历日        
        /// </summary>        
        /// <param name="day">天</param>        
        /// <returns></returns>        
        public static string GetLunisolarDay(int day)
        {
            if (day > 0 && day < 32)
            {
                if (day != 20 && day != 30)
                {
                    return string.Concat(days1[(day - 1) / 10], days[(day - 1) % 10]);
                }
                else { return string.Concat(days[(day - 1) / 10], days1[1]); }
            } throw new ArgumentOutOfRangeException("无效的日!");
        }
        /// <summary>        
        /// 根据公历获取农历日期        
        /// </summary>        
        /// <param name="datetime">公历日期</param>        
        /// <returns></returns>        
        public static string GetChineseDateTime(System.DateTime datetime)
        {
            int year = ChineseCalendar.GetYear(datetime);
            int month = ChineseCalendar.GetMonth(datetime);
            int day = ChineseCalendar.GetDayOfMonth(datetime);
            //获取闰月， 0 则表示没有闰月            
            int leapMonth = ChineseCalendar.GetLeapMonth(year);
            bool isleap = false;
            if (leapMonth > 0)
            {
                if (leapMonth == month)
                {
                    //闰月                    
                    isleap = true; month--;
                }
                else if (month > leapMonth) { month--; }
            }
            if (!GetLunisolarDay(day).Equals("初一"))
            {
                return GetLunisolarDay(day);
            }
            else
            {
                return string.Concat(isleap ? "闰" : string.Empty, GetLunisolarMonth(month), "月");
            }
        }
        /// <summary>        
        /// 根据公历获取农历日期        
        /// </summary>        
        /// <param name="datetime">公历日期</param>        
        /// <returns></returns>        
        public static string GetChineseDateTimeForMonth(System.DateTime datetime)
        {
            int year = ChineseCalendar.GetYear(datetime);
            int month = ChineseCalendar.GetMonth(datetime);
            int day = ChineseCalendar.GetDayOfMonth(datetime);
            //获取闰月， 0 则表示没有闰月            
            int leapMonth = ChineseCalendar.GetLeapMonth(year);
            bool isleap = false;
            if (leapMonth > 0)
            {
                if (leapMonth == month)
                {
                    //闰月                    
                    isleap = true; month--;
                }
                else if (month > leapMonth) { month--; }
            }
            return string.Concat(isleap ? "闰" : string.Empty, GetLunisolarMonth(month), "月", GetLunisolarDay(day));
        }
        /// <summary>
        /// 转换为中文的星期
        /// </summary>
        /// <param name="dayOfWeek">当前星期</param>
        /// <returns>返回中文星期</returns>
        public static string GetChineseWeek(DayOfWeek dayOfWeek)
        {
            return chineseWeek[(int)dayOfWeek];
        }
    }
}
